Process of making oxalates.



UNITED STATES PATENT OFFICE.

ARNOLD WIENS, OF BITTERFELD, GERMANY.

PROCESS OF MAKING OXALATES.

SPECIFICATION forming part of Letters Patent No. 714,347, dated November25, 1902. Application filed August 25, 1902. Serial No. 120,985.. (NoSpecimens) paring oxalates from formates.

According to the patent of the United States No. 659,733 the formateused in the preparation of oxalate is mixed with soda and then heated tofrom 360 to 400 centigrade. This method of preparation of oxalate is,however, attended with the grave disadvantage that in order to recoverthe soda which has been mixed with the formate it has to be extracted bylixiviation, the solution being afterward evaporated and calcined. Theseare very inconvenient and costly accessory operations, all the moreobjectionable as the amount of soda which must be mixed with the formateis larger than the amount of oxalate that can be obtained by theprocess. Now this process may in accordance with the present inventionbe considerably simplified by mixing with the formate not soda, butoxalate prepared beforehand and by heating. the mixture to from 360 to410 centigrade. In this case also a reaction takes place; but theevaporation and calcination of the soda solution become unnecessary.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. A process for the preparation of oxalates, consisting in heating amixture of formates with oxalates.

2. A process of the preparation of oxalates consisting in heating amixture of formates with oxalates to a temperature of from 360 to 410centigrade.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

ARNOLD WIENS.

Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

